When I render it I got a fully black image
Black or blank output has been covered before. Look here.  

You need to add a lamp to your scene. There is no source of light, and therefore the render is black. To add a lamp hit Shift+A while your mouse is in the 3d window, and select any lamp type as shown in the screenshot below:



While the default position it is placed in might not be ideal, you could move the lamp after adding it. The render right after inserting the lamp will look like this: